Im triying a fix for this atm. I post here if the fix has worked (im removing and reinstalling cpanel pro in release version.

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I'm not installing cpanel pro, but having the same problem as you.

The problem came up when suddenly I could not sending emails (smtp reject my pass auth), but I can receive email, thru my email client, then the tech rollback the cpanel into stable version (previously using latest current version). It fixed the sending problem, but giving another problem like we have now.

one off my clients had also the problem, when he sends an email, it's being delivered, but the client also receives an "Mail delivery failed: returning message to sender":
Time::HiRes object version 1.65 does not match $Time::HiRes::XS_VERSION 1.72.

So, I executed Chirpy's commands:

/usr/local/cpanel/bin/boxtrapper => gave the same error: OK

rm -fv /usr/local/cpanel/bin/boxtrapper => OK

/scripts/upcp --force => OK

Then try running this again:
/usr/local/cpanel/bin/boxtrapper
and hopefully it should just give a message: Unable to locate information.

=> NOT OK, it gives: " /usr/local/cpanel/bin/boxtrapper: No such file or directory"

Could this be a problem ? I say this because since I did this yesterday, I receive less mail as normal, maybe 50%. Also a client complains that he doesn't receive anymore email at all...

one off my clients had also the problem, when he sends an email, it's being delivered, but the client also receives an "Mail delivery failed: returning message to sender":
Time::HiRes object version 1.65 does not match $Time::HiRes::XS_VERSION 1.72.

So, I executed Chirpy's commands:

/usr/local/cpanel/bin/boxtrapper => gave the same error: OK

rm -fv /usr/local/cpanel/bin/boxtrapper => OK

/scripts/upcp --force => OK

Then try running this again:
/usr/local/cpanel/bin/boxtrapper
and hopefully it should just give a message: Unable to locate information.

=> NOT OK, it gives: " /usr/local/cpanel/bin/boxtrapper: No such file or directory"

Could this be a problem ? I say this because since I did this yesterday, I receive less mail as normal, maybe 50%. Also a client complains that he doesn't receive anymore email at all...

FYI: I am running STABLE build WHM 10.1.0 cPanel 10.2.0-S83

Do I have to fix boxtrapper or isn't this a problem ?

Thank you !

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I would recommend going to RELEASE that's what I did and it worked perfect!